[GitHub] [arrow-rs] jorgecarleitao commented on issue #1091: Ergonomic field and schema creation with Metadata

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jorgecarleitao commented on issue #1091:
URL: https://github.com/apache/arrow-rs/issues/1091#issuecomment-1003747841


   I was waiting for another (soon to be PR) before reporting here, but basically it is possible to remove `Option` and also to replace `HashMap` in Schema by `BTreeMap`, thereby making both use the same data structure.
   
   There is a larger change going on there, https://github.com/jorgecarleitao/arrow2/pull/717, that removes `RecordBatch` (in line with the requirement coming from this issue: https://github.com/apache/arrow-datafusion/issues/1248 and https://github.com/jorgecarleitao/arrow2/issues/673) - I am waiting for that to land before PRing the `HashMap -> BTreeMap`, since the broader observation is that `Schema` can be greatly simplified as there are no internal invariants on it (basically everything inside can be made public and we do not need any accessors for it).


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